JPS5825775A - Display system for position of video tape - Google Patents

Abstract

PURPOSE:To detect position information of a tape during photographing with a simple constitution, by displaying position information of the tape in the visual field of the finder of a video camera on a basis of the rotation signal of the reel shaft of the video tape. CONSTITUTION:Picture information picked up by a video camera 4 is transmitted through a cable and is recorded on a video tape in a video cassette recorder 1. At this time, rotation signals are outputted from sensors 3a and 3b which detect the rotation of a reel 2a, and these signals are applied to an operating circuit 6 through an amplifier 5. The operating circuit 6 processes rotation signals to output position information such as the position of the video tape (signal count value), the period corresponding to the residual quantity, and the elapsed time to an electronic display 7.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a video tape position display system for displaying video tape position information ti within the viewfinder field of a video camera.

It is known in the art to provide a video cassette recorder with a mechanical or electronic power source for indicating the position information of the video tape. However, when used in a multiple video system, when recording image information captured by a video camera on a video cassette recorder, it is necessary to know the position information of the videotape at that time during the recording, and then move from the subject to be photographed. It was necessary to close my eyes and watch the video cassette recorder, which was extremely inconvenient and difficult to use.

In order to solve these problems, a device was proposed that would optically display the distance traveled by the videotape (t) on the video camera by guiding the mechanical KAWANTA display provided on the video cassette recorder to the video camera via glass fiber. (Utility Model Application Publication No. 49-92825) 6 However, in a device like ξ, it is difficult to know the tape position on the video camera side, since the cable is thick due to the use of glass fiber, and the video The disadvantages were that the camera was difficult to operate, and the optical mechanism at both ends of the glass fiber was complicated.

The present invention has been carefully considered with these points in mind, and its purpose is to provide a video camera with a simple configuration that allows the positional information of a videotape to be known while the video camera is recording the image. Tape position display method [will be provided].

In order to achieve such an object, the present invention provides tape position information based on a rotation signal of a video tape reel shaft of a video cassette recorder within the viewfinder field of a video camera using an electronic indicator. This allows the tape position information to be recognized sequentially during filming.

Hereinafter, the present invention will be explained in detail with reference to Examples.

FIG. ts1 is a block diagram of a video system applied to an embodiment of the videotape position display method according to the present invention.

[In, 1 is a video cassette record/, 2m, 2b
is a cassette reel with videotape wound on it, Sm, $
- is a sensor that detects the rotation of reel 2. These sensors 3a and Ib detect the rotation of the reel shaft by known optical, magnetic, and electrical means, and output rotation signals.

t7'j, 4t; i Video cassette recorder 1 and a video camera connected by a cable, 5 an amplifier for amplifying the rotational signal, 6 processing the rotational signal and determining the position of the videotape (
A traffic light? ([), an arithmetic circuit that outputs position information such as remaining battery time and elapsed time, and an electronic display that displays a 7Fi position information signal. This electronic flash display T has a 4-digit arrangement of sun-shaped segments, and is electronically displayed using a liquid crystal light emitting diode, a flashlight, a narrow display tube, etc.

Note that 8 is a video cassette recorder 1. Video camera 4
This is a mode switch used when checking the battery that is the driving source of the machine.

In addition to using a dedicated arithmetic circuit 6, the video camera 4
It is also possible to use a part of the electronic circuit that processes the imaging signal.

FIG. 2 is a schematic structural diagram of the video camera 4, and FIG. 3 is a diagram of the image displayed on its finder.

In Figure K, 10 is the subject, 11 is the lens, 12 is the half prism, 13 is the half prism 12 [The image of the subject 10 that passes through it is captured. rtfC subject 1
Reflection mirror that reflects the image of 0, 15 is Sorimachi, mirror 14
16 is the finder cap, 17 is the grip, and 1 dollar is the press release button to start shooting. Above the viewfinder 15 is an electronic narrow indicator T.

The image displayed in the finder is displayed on the electronic display T within the finder frame 20 and outside the effective photographing area frame 21, as shown in the third WAK.

Note that 22 is a split image.

When shooting with the video camera 4, when you look through the finder 1S, the subject appears and at the same time the position information of the videotape ``II'' is displayed.
Show X people. When the release button 1S is pressed, shooting starts, and the video cassette recorder 1 operates and the reel rotates, at the same time an image signal is supplied to the head and a sickle image of the subject is created. Reel OWA@ when the rice field starts or starts)
The 11 turn signal is output, and the tape position information is sequentially displayed on the electronic indicator T.

In the past, when the display on the electronic display showed a fixed value and stopped, it meant that the video camera was not recording. can do.

FIG. 4 is a diagram of an image displayed on the finder of another embodiment.While the previous embodiment used a reflex-type optical viewfinder, this embodiment uses an electronic viewfinder. , a subject image tf is outputted from the image pickup tube 13 to a small black-and-white plastic one tube by an image signal output from the image pickup tube 13.
R shows something.

In the figure, 23 is the face panel surface of the plastic tube. An electronic display T is arranged above this face panel surface 23.

In addition to installing the electronic display directly in the viewfinder,
It is also possible to arrange the display at another location and optically guide the display into the viewfinder.

In the above embodiments, the video cassette recorder is provided with only a sensor, and the video camera is provided with an amplifier and an arithmetic circuit, but these may also be provided in the video cassette recorder IK. It goes without saying that a video recorder can also be equipped with an electronic display.

As described above, according to the videotape position display method of the present invention, since the videotape position information Ve is displayed in the finder of the video camera, it is possible to know the p-wand value of the tape position and the remaining amount of tape while shooting. be able to. In addition, in the past, the KV in the viewfinder displayed the letter t during filming, which was rarely necessary due to the expense, but with the present invention, the display of the tape position information changes during filming. Status! I
Since it is possible to recognize the TFFE, there is no need to provide a special TFFE indicator, and the structure is simplified.

[Brief explanation of drawings]

FIG. 1 is a schematic diagram of a video system applied to an embodiment of the videotape position display method according to the present invention, FIG. 2 is a schematic structural diagram of a video camera made by Zusha Co., Ltd., and FIG. 3 is a diagram of an image displayed on a finder. Image diagrams of other actual examples of Tuna 4 Zusha Finder are available. 1...Video book set recorder, 7m, 3b---
・Reel, 31a, ale...sensor, 4...
...Video camera, 6...Arithmetic circuit, T...Electronic f, ll indicator, 15...Finder, 20...
- Finder frame, 21... Shooting effective area frame. Patent applicant Masaki Yamakawa (and 1 other person), Tamura Electric Manufacturing Co., Ltd. agent

Claims (1)

[Claims] In a system for transmitting image information scanned by a video camera to a video cassette recorder via a cable and recording it on a video tape, the video cassette recorder is provided with means for extracting a rotation signal of a reel shaft of the video tape, An electronic public display Yt8 displays position information of the video tape within the viewfinder field of the video camera based on the rotation signal, and the electronic display displays the position of the video tape while the video camera is shooting. A videotape position display method that shows information sequentially.